ios - 使 UIPickerView 结果导入文本到 UILabel

Question

我想让用户从 UIPickerView 中选择的内容直接填充到它下面的 UILabel 中。更具体地说，如果他们选择“维生素 A”，它将以 UILabel 中的文本形式提供以下信息。我是 Xcode 和 Swift 的新手。我已经让选取器在 UILabel 中工作并连接，但还没有弄清楚如何在不复制 UIPickerView 中已有的文本的情况下将两者连接起来。这是我到目前为止的代码:

@IBOutlet weak var Description: UILabel!
@IBOutlet weak var picker: UIPickerView!

var pickerData: [String] = [String]()

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.

    // Connect data:
    self.picker.delegate = self
    self.picker.dataSource = self

    // Input data into the Array:
    pickerData = ["Pick a Vitamin", "Vitamin A", "Vitamin B1", "Vitamin B2", "Vitamin B3", "Vitamin B5", "Vitamin B6", "Biotin", "Folic Acid", "Vitamin B12", "PABA", "Choline", "Inositol", "Vitamin C", "Vitamin D", "Vitamin D3", "Vitamin E"]
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}


// The number of columns of data
func numberOfComponentsInPickerView(pickerView: UIPickerView) -> Int {
    return 1
}

// The number of rows of data
func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
    return pickerData.count
}

// The data to return for the row and component (column) that's being passed in
func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
    return pickerData[row]
}
// Catpure the picker view selection
func pickerView(pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
    // This method is triggered whenever the user makes a change to the picker selection.
    // The parameter named row and component represents what was selected.
  }

}

Answer 1

将 didSelectRow 方法更改为如下内容:

// Catpure the picker view selection
func pickerView(pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
    // This method is triggered whenever the user makes a change to the picker selection.
    // The parameter named row and component represents what was selected.
    Description.text = pickerData[row];
}